Process of rendering soluble insoluble phosphates.



ject to. produce a method which will be v more etlic lent, as well as-more expeditious,

pointed out in the'cla'ims.

wet grinding Unrrnn STATES PATENT OFFICE.

WALTER LANDIS, OF NIAQARA FALLS, ON'IARIO CANADA, ASSIGNOR '10 AMERICAN CYANAMID COMPANY, QI N ASHYILLE, TENNESSEE, A CORPORATION OF MAINE.

' PROCESS OF, RENDERING SOL'tIBLE INSOLUIBLE PHOSPHATES.

No Drawing.

Patented July 14, 1914.

To all whom it may concern:

Be it known that I, 'WALrnn S. Lenore, e citizen of the United States, residing at Niagara Falls, in the Province of Ontario and Dominion of Canada, have invented certain new and useful Improvements in Processes of Rendering Soluble Insoluble Phosphates; and I do herel'iy dcelare the following to be a full, clear..and exact description of the in vention such' as will enable othersskilled in use the same.

This invention relates to a recess of rendering soluble-the insolublep iosphates contained inphosphatelores, and has for its obt-han themcthods heretofore proposed.

To thesev ends th e invention consists in the novel steps and combinations of stepsmore fully hereinafter disclosed and particularly In my c'opending application entitled Process of 'fproducing available phosphoric acid, filed July :12, 11913, Numbeifi'iYSfl 30, 1' have briefly'stated. the objectionsto the present modes of procedure, and have disclosed a method'which'overcomes said objections involving the use of a drier and a calcining furnace.) According to the method of this application, liowever,.-I am enabled to se-- cure the same, results without necessitating the use of said drieror furnace; as will now apeanccording to this invention I reduce, the phosphate rock,fandthe sodium sulfate, aL SOQ," or sodium curbonete Na GO to. a fine powder and treat it with waterthe some or substantiallyv thesaine as in my application'above; I 'Butl instead-of first drying'and then calcining the' mixtfn're, as in saidlap'plication,I thoroughly mix finely divided carbon such as powderedcoal oncoke w itlijthe wet mass, or I may grindthefmixturehE a 'processgcafter the carbon as been added- The imixtu're containingfcnrbon is next placed one suitableperforatedgrate' and .ign1ted,-.wh1lefeir is, Iforced through under pressure to jnsnreth t the clinkering or burning of 'themassfwill take place simultane'ously with the, drying. I The opera tions of clinkering'and burning follow .so

' closed.

"phosphoric acid which-[consists in qluickly after the drying of each particle tiat there isno time for crystals to form and thereforethere is no segregation or se'pcrating out of the sodium salt. Should th latter action be permitted to occur, the 0th- -iency of the conversion of the insoluble phosphates into the soluble form would be greatly lessened as stated in my application above. On the other hand by performing the sintering, clinliering or burnin operations while the sodium salts are still thor oughly distributed throughout the-mass the efficiency of the above conversion remains high as was the case in my said copending application.

I find that a wet mixture of say four is quite satisfactory. The mass dries very repidl indeed, puiis u and thensinters in a per eetmanner,- an an analysis of the inches thick and heated up to say 1500 C.

product shows a most satisfactory high yield of soluble phosphates. .Oil or as'may be conveniently used for ignitingt e mass.

Although this processresembles the well ki'iown-sintering processes employed with other materials, yet thisis mall a chemical Y I process in theta well known efinite rezw tion is broughtsbout Joy the. treatment dis- After the it is then pre erably finelyits highest availability.

What Iclaim is:-- Y

roduct prodiieedi as tam,

ground todevelop I Let.

1. The process of producing aveileble; phosphoric acid .whiehconsists in providing a finely divided mixture of phosp ate 2'. The---gprocess of producing aveiliible rock ' e solublealt ofsodiuin, water and carbo'nz i. and burning the same before the sodium salt has hadtime to crystallize to a substantial i degreepsubstantially its-described;

hosphoric acid which consistsiim rovidi-ng afinely xdivided mixtureof'phosp ate rock,

a] soluble salt? of: sodium, water and carbon, I and burning the'samebefore said salt crystallizes to a. 'IsubstantiaI-"extent and while blowin 'eir through the mixture; 1*3. e"proce.e of producing a. ifinel divided mixtnreofp phosp ate rock; a sole 1e salt; of sodium, water; and carbon;

burning the same before the-"said salt has substantially as described.

veilable 1 )iOVid HIQ" I;

4. The process ofproducing. available phosphoric acid which consists in roviding.

a finely divided mixture of phosp ate rock,

a, soluble salt of sodium, water and carbon; mixtui-e of plxos ph-qte mwlgnAsul-ublc salt of 1-0 burning the same before the said salt has sodium and carbon and water, substantiglly time to crystallize; blowing air through the as described; mass dur'inq the burning operation, and In testimony whereof I uflix my signature, 5 finely dividlng the resultmg product, sulo-v in presence of two witnesses.

, stantially as'described. WALT 1GB- AN DIS.

5,. The herein described new c'omposi-I "Witwsses'f tion of matter suitable for igniting on a per- I S. HANNA, .forated grate consisting of a" finely divided J. L; DOLAN. I

e I. I 

